Soaking-drum apparatus



April 2 1929- H. H. HEwETsoN soAxING DRUM APPARATUS Filed March 16. 1927 @@@MMQ YPatented Apr. 2, 1929.

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HENRY H. HnWn'rsoN; orv NEWTON CENTER, MASSACHUSETTS, AssIGNoR TovnEAooN OIL COMPANY, on .EVERETTg.'MAssACHU'sETTs `A CORPORATION oFMAssACHU- SETTS.

soAKiNG-DRUM 'APPARATUS- ppiieannn-ieairiarchlia 1927. `semi No. 175,911.

Suchvessels as the ylarge steel soaking drums, ttor exainple, extensively' employed -in refineries tov hold underliigh heat and pressure liquid oily products, during the coniiple-4 tion by tinie'oi2 the cracking ofheavier hydrocarbon oils toinorevolatile products, such as gasoline, lhave lionndrto deteriorate under chemical reaction affecting only such parts of the containers asare in contact with the gases and vapors, as distinguished `frein Athe liquids,

oi'' the reacting contents. "-Undei ,familiar practice, `these vessels niay be 'end-capped. cylinders ,standing upright, having an internal diameter of as inuchas six feet,alieight of the order'fcf'ortyfiieet, and built 11p-.of4

plates fronithree to live inches thick so as to withstand internal pressures ofinuch incre` than the usual pressure ot about 400 vpounds.

to the square inch vvith safety, at internal temperatures ranging' freni ,5(l0fD to QOO'QF. The hazards tol life and property from eX# plosions and iirefiloivingA i-roin the possibilityk of iuptiireoit anyV of thesecontainersare very great, Vand have heretofore led to frequent replaceinent-s Vwhen Corrosive. deterioration of the upper vparts ol' the druins has progressed to something short of any dangerousextent.

The t, inassive nature of these vessels makes their replacement a naat-ter of great expense of v labor and idle time oflapparatus, as Well as for the metallic vessell itself. The factors leading to corrosion and pitting, which niay be due to hydrogen, sulfur or other conipo- V.nents of the contents under thesevere conditions of heat and pressure, are of ysuch `a nature as to prevent-'their being avoided cheinicallyor by any effective expedient'of interior protection oic theine'tal of so large a built-up structure as a soaking 'drum from the faction of the corroding vapors yby a perinaf A Y 'frelief pipe connection, as shown inade as anv Y integral doinel surniounting 'the extension nent or replaceable lining. 1 This invention has as obiects utilization of the observed iniinunity troni corrosionjoff y such'parts of such vcontainers as are continul sity for replacingv any part, of the large vessel ously covered by liquid to prevent anyl necesitself; to provide a construction effective necessities ol the use of such apparatus which can be putinto a sale condition When deterii against deterioration and operative for the orated Without great delay or expense; and

to provide for increasing thestorage capacity of such containers eiiectively Without subjecting thein to cheniicaldeterioration. l

-The invention is illustrated in a preferred form in the accompanying drawing, in` which 1 `the ligure is a detail elevation partly in vertical section oii a typical container. 1

Referring tothe drawing, a soaking druin 2 is shown as of a forni generally einployed for thetreatinent of oil processes in which detentionwhile hot inta still or agitated `pool is required, oil being slowly feel tothe d ruinf `2 from a tubular heater in which it reaches an effective,temperature .tor cracking through alowerinduct opening, notl shown,'and being` ivithdraivn at substantially rsaine'rate,rso as: to allowsuiiicient time to perinit desired rcactions to-taleplace- The teinperature of hocdfof 8011o F., although any' temperature `frein '500 to 900o l?. inaybe employed; The

druni 2 inayconiprise flanged educt nipples 21,21 for, customaryconnections, which open-r tli'e oil Vin the druin 'inay be in the neiglibon,`

ings accordingv to thisinventionniay be closed by suitable caps22, 22.r The heavy donned..

endof thedruin 2 at23 usually integral with a'flang'ed in'anhole extension 20. f

lVlien educt pipes at` 21vandva closure cap on extension 2O Were einployed, -the upper end of the driiin'g`24 and'thefinterior of thefc'ap 2,3

necessarily Were used to vprovide a. vapor eX- pansion chamber,` which was-cf anfunnecess sarilylarge volume. In this space the inte-- rior surfaces were corroded inost actively.

` Forthe purposes of the vpresent invention, I prefer to make certain that the interiorof` the diuin 2 and its integral extension`20 are covered by the liquid contents, and for this" Vprovide for lifting the upper level of the oil pool ,v'velll beyond the druin 2,',doined end 28,

and', if desired, Vasv far, for. eXainple, asthe level,ja2,.by'providing as a separable entity aneduct connection, expansion chainber, and

20,'ianged at 18, and fastened as by the heavy bolts 16 to jtlie iiange 2().j This separable part f to receive-and hold contents at pressures of ably supported by Webs 7 and 9, if desired, and having at its upper end 10 a flanged nipple to receive a safety or relief valve 12, of any usual type suitable to blow at heavy pressures. rlhe casing of valve 12 may provide, as shown, a convenient connection for the vapor relief pipe 14C for taking off the overflow gases, if any, at excessive pressures.

The removable extension l thus contains the region in which corrosive action may be expected, and being relatively a much less massive object than the drum 2, may be made of materials or treated as to its inner surface so as to provide a longer life than the upper part of drum 2 could be expected to have. Dome 4; may be made of an alloy steel of superior resisting power, for example, -or it may be provided with an electroplated or otherwise coated interior surface of relatively inert material. lf and when deteriorated,

the dome 4C may be replaced at relatively v slight expense of cost and delay,'as compared with replacement ofthe drinn 2.

l I claim: i y l. In a deviceV of the classwdescribed, the combination of a container for oil adapted several hundred pounds yto the square inch and temperatures of the order of l5()o to 9000 F., with means for maintaining .the

Whole interior surface of said container in f Contact with oil in a liquid state comprising a removable extension at the top of 'the container into Which the liquid oil extends during use of the said container, and means connected With the said extension for drawingr oif oil therethrough, and an educt passage in said extension communicating with a vapor space in said extension above the oil. Y 2. In soaking drum apparatus subject to interior Vcorrosion by contained vapors or gases, a soaking drum proper capable of holding a large still or agitated pool ofv oil under relatively high pressure and temperature, a removablemetal .extension connected to the upper end of said container, means having an educt passage for liquid oil forming a part of said extension member, and means in said extension having a vapor passage and adapted to receive a vrelief valve for relieving excess pressure therein.-

3. Soaking drum apparatus comprising a beattached to asoaking drum or other con tainer, anda body portion affording a gas space above said educt connection and having yan outlet nipple for oil vapors at substantially the end of said extension opposite its attachment flange, in combination with a safety valve casing and valve adapted to be attached to said'outlet nipple.

5. In a soaking druin apparatus subject to interior corrosion by contained vaporV or gases, a soaking drum proper cap ableof holding a pool of oil under relatively highpressure and temperature, means at the upperend of said drum for removably Aattaching an eX- tension of reduced cross section: and a re-V movable inetal extension of reduced cross section removably attached to the. upper Vend of said container, said metal extension having therein an educt passage for liquid oil, said extension also having a vapor passage adapted to receive and be closed by a relief valve for relieving excess pressure-therein.

Signed by l this 12th day of March, 1927. Y

HENRY H. HEVJETSON me at Everett, Massachusetts, 

